Pencil



Patented Dec. 2, 1924.

UNITED STATES PATENT ortica.

ELMER S. SHIMER, 0F MILTON, PENNSYLVANIA.

PENCIL.

Application led .Tune 6,- 1921.

f ing and consequently are ideal for mechanical pencils.

This present invention consists of three main parts, namely, a tube, aspiral and a pin, all properly assembled and encased in an outer holderwhere they may be held in place by friction.

In the accompanying drawings Fig. 1 is a sectional view through myimproved pencil with all parts assembled. Fig. 2 is a side view of thetube, Fig. 3 is a similar view of the spiral and Fig. 4 is a view of thepin.

A represents the spiral, one end being in the form of a solid tube,having a circumferential groove 2 a short distance back from the end andtapering from the groove to a thin edge at the end.

The numeral 3 indicates the pin with a turned up neck 4 at one end, asshown in Fig. 4.

The numeral 5 is the tube, see Fig. 2. rThis has a narrow slot 6 runninglongitudinally from the outside into the bore T. A shoulder 8 is formednear one end and from the shoulder the end of the tube gradually tapersto nothing.

The numeral 9 is the holder or body and while the other parts are ofmetal, this is preferably of hard rubber.

The parts are assembled by holding the turned up end 4 of the pin whilethe free end is inserted through the slot 6, in the tube, in thedirection of the taper. lVhile still held in this position the spiral Ais sleeved over the free. end of the pin and pushed on into the tubeuntil the end of the spiral reaches the turned up end, whereupon it isturned, thus causing the pin to feed, the slot 6 confining its movementstrictly to an endwise travel. Vith a small Serial No. 475,426.

die machine the thin end of the tube is pressed into the groove 2 thuspermanently uniting the three parts, into a unit ready for introductioninto the holder, where it is held frictionally, the endof the holder '1:

stopping against the shoulder and the tapers of the holder, tube andspiral member forming one general taper. The spinning of the end of thetube into the groove 2 confines all movement of the tube and spiral to aturning movement, all endwise movement of said parts being precluded. Inlike manner the pin moves straight and does not turn.

The lead is inserted through the end and is backed and fed by the pinand the lead is fed forward when requiredby grasping the tapering orprotruding end 9 of the spiral between the finger and thumb of the lefthand and by turning the holder and with it the tube with the right hand,to the right. To insert a new lead the holder is turned to. the left,and in the same way the lead may be pushed back if it is out too far.The lead holds its place in the bore of the spiral frictionally.

I claim As an article of manufacture, a mechanical pencil comprising alead actuating pin having a neck or lug, a longitudinally boredlead-holding tube of uniform external diameter throughout its entirelength except for a taper at one end and a recess or groove adjacent thetaper, and in which tube the pin is slidably mounted, a helical slotn'iilled in the tube at the opposite end from the recess or groove inwhich the neck or lug of the pin has a slidable adjustment, alongitudinally slotted housing tube of uniform internal diameter inwhich the lead-holding 'f tube is inserted and rotatably supportedthroughout its length, a portion of the pin projecting into saidlongitudinal slot and adapted to be guided thereby, the end of saidhousing tube having a tapered edge adapted to be spun into the recess ofsaid leadeholding tube for permanently engaging the two tubes, saidhousing tube being provided with an external shoulder and a casingfunctionally engaging the housing and abutting said shoulder'.

In testimony whereof I hereunto affix my signature.

ELMER S. SHIMER.

